Nope. It's as optional as openfeint. That said, we don't yet have the functionality to include either it, so it's a non-issue.
You can start planning for it now, by building games that have great 'score attack' game modes and achievements. Which, so far, seem to be a the biggest features of Game Center.
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You can start planning for it now, by building games that have great 'score attack' game modes and achievements. Which, so far, seem to be a the biggest features of Game Center.